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Reports declarations of <code>equal()</code> with a single parameter.
Normally, this is a typo and <code>equals()</code> is actually intended.
<p>A quick-fix is suggested to rename the method to <code>equals</code>.</p>
<p><b>Example:</b></p>
<pre><code>
  class Main {
    public boolean equal(Object obj) {
      return true;
    }
  }
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  class Main {
    public boolean equals(Object obj) {
      return true;
    }
  }
</code></pre>
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